Charles XV of Sweden was born on May 3, 1826, and became King of Sweden and Norway in 1859. He was the son of King Oscar I and Queen Josephine, and his reign lasted until his death in 1872. Charles XV was known for his efforts to modernize the monarchy and improve the welfare of his subjects. During his rule, Charles XV promoted cultural and educational advancements, supporting the arts and sciences. He was also involved in political reforms, working to strengthen the relationship between Sweden and Norway. His legacy includes a more unified and progressive Scandinavian region.